全文获取类型
收费全文 | 5791篇 |
免费 | 203篇 |
国内免费 | 6篇 |
专业分类
化学 | 3252篇 |
晶体学 | 20篇 |
力学 | 108篇 |
数学 | 692篇 |
物理学 | 1928篇 |
出版年
2021年 | 52篇 |
2020年 | 60篇 |
2019年 | 52篇 |
2018年 | 49篇 |
2017年 | 63篇 |
2016年 | 156篇 |
2015年 | 112篇 |
2014年 | 144篇 |
2013年 | 235篇 |
2012年 | 272篇 |
2011年 | 329篇 |
2010年 | 157篇 |
2009年 | 132篇 |
2008年 | 269篇 |
2007年 | 252篇 |
2006年 | 235篇 |
2005年 | 232篇 |
2004年 | 174篇 |
2003年 | 150篇 |
2002年 | 124篇 |
2001年 | 103篇 |
2000年 | 90篇 |
1999年 | 79篇 |
1998年 | 61篇 |
1997年 | 77篇 |
1996年 | 77篇 |
1995年 | 89篇 |
1994年 | 73篇 |
1993年 | 85篇 |
1992年 | 86篇 |
1991年 | 60篇 |
1990年 | 65篇 |
1989年 | 57篇 |
1988年 | 59篇 |
1987年 | 62篇 |
1986年 | 55篇 |
1985年 | 60篇 |
1984年 | 64篇 |
1983年 | 54篇 |
1982年 | 61篇 |
1981年 | 61篇 |
1980年 | 45篇 |
1979年 | 54篇 |
1978年 | 55篇 |
1977年 | 47篇 |
1976年 | 50篇 |
1975年 | 57篇 |
1973年 | 45篇 |
1964年 | 44篇 |
1956年 | 45篇 |
排序方式: 共有6000条查询结果,搜索用时 15 毫秒
1.
2.
3.
Hansen Karin Vels Kreka Kosova Jacobsen Torben 《Journal of Solid State Electrochemistry》2019,23(3):811-822
Journal of Solid State Electrochemistry - Local cathodic polarizations of yttria-stabilized zirconia were carried out with a PtIr probe as the working electrode in a controlled atmosphere high... 相似文献
4.
J. Maul I. Strachnov S. Karpuk P. Bernhard A. Oelsner G. Schönhense G. Huber 《Applied Physics A: Materials Science & Processing》2006,82(1):43-47
We report morphologic changes of metallic surfaces at the onset of ablation, starting from gentle ablation to the emergence of ablation craters. The evolution of both observed melting zones and of ablation craters therein are investigated in dependence of the ablation laser fluence for nanosecond ultraviolet laser pulses. Further, consequences of crater formation for cluster synthesis within the released atomic vapor are pointed out. PACS 52.38.Mf; 79.20.Ds; 65.40.De 相似文献
5.
We study the relation between the cohomology of general linear and symmetric groups and their respective quantizations, using Schur algebras and standard homological techniques to build appropriate spectral sequences. As our methods fit inside a much more general context within the theory of finite-dimensional algebras, we develop our results first in that general setting, and then specialize to the above situations. From this we obtain new proofs of several known results in modular representation theory of symmetric groups. Moreover, we reduce certain questions about computing extensions for symmetric groups and Hecke algebras to questions about extensions for general linear groups and their quantizations. 相似文献
6.
Karin Cvetko-Vah 《Semigroup Forum》2004,68(2):268-279
Given a ring $R$, let $S\subseteq R$ be a pure multiplicative band that is
closed under the cubic join operation $x\nabla y = x+y+yx-xyx-yxy.$ We show that
$\left( S,\cdot,\nabla\right) $ forms a pure skew lattice if and only if $S$
satisfies the polynomial identity $\left(xy-yx\right)^{2}z = z\left(xy-yx\right)^{2}$.
We also examine properties of pure skew lattices
in rings. 相似文献
7.
The control of piecewise-deterministic processes is studied where only local boundedness of the data is assumed. Moreover the discount rate may be zero. The value function is shown to be solution to the Bellman equation in a weak sense; however the solution concept is strong enough to generate optimal policies. Continuity and compactness conditions are given for the existence of nonrelaxed optimal feedback controls. 相似文献
8.
9.
S. Trebert Haeberlin F. Lux J. Karl T. Spruss H. Schönenberger 《Journal of Radioanalytical and Nuclear Chemistry》1987,113(2):461-467
As part of an examination of the cytostatic effects of 1,2-diarylethylenediamine-platinum(II)-complexes the contents of platinum and biologically essential trace elements of tumour tissue and different organs were determined. The activation analysis procedure — separation of32P, isolation of199Au and99Mo — is described. In the course of a pharmakokinetical experiment with tumourbearing rats (DMBA induced hormone-dependent tumours) the desired enrichment of the administered drug in the tumour tissue was found. Changes of the trace element level of tumour tissue were found for hormone-dependent MXT-mammary tumours on mice. 相似文献
10.
Vlasov Yu. G. Murzina Yu. G. Legin A. V. Ermolenko Yu. E. Schubert J. Schüoning M. J. Lut H. 《Russian Journal of Applied Chemistry》2002,75(3):351-356
Methods of silicon planar technology and pulsed laser deposition were applied to fabricate fully solid-state chemical sensors for determining ions of copper, lead, cadmium, thallium, and also sulfide and chloride ions on the basis of thin chalcogenide films as ion-sensitive membranes. 相似文献